So- it has to be from a musical? The first one I thought of is the one Roxie does in Chicago- I think it's before she sings the song Roxie. Also- I see you just joined the board so I'll let you know, the student board doesn't get many responses and the other boards may not help you because you just joined the boards and the first thing you did was ask for audition material. There are plenty of articles on google if you type in monologues from musicals. Good luck- oh- and it would have helped you more if you could use the words please, thank you, and maybe a little intro as to who you are. Anyway, good luck. Also- you can check the college confidential boards for musical theatre for suggestions.
There are also some of the girls in Cell Block Tango who have monologues although they are relatively short. My personal favorite is the gum one. I would so use that one for an audition.